Spark plug protector



July 2l, 1936. J. D. KONDRUP SPARK PLUG PROTECTOR Filed April 25, 1954 [nivenior Jozv Koh/rap l/qllormzy Patented July 21, i936 FFIE SPARK PLUG PROTECTOR John D. Kondrup, Keyport, N. J.

Application April 25, 1934, Serial No. 722,372

`1 Claim. (Cl. 123-169) This invention relates to -a protector for spark plugs, the general object of the invention being to provide means for preventing moisture and foreign matter from collecting on the porcelain or other non-conducting body of the plug, which often results in short circuiting the plug.

This invention also consists in certain other features of construction and inthe combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which:- y

Figure 1 is a fragmentary sectional view through part of a motor, showing the invention applied to a spark plug.

Figure 2 is a plan view of the device.

Figure 3 is a section on line 3-3 of Figure 2.

In this drawing, a part of the motor is shown at A, the plug at B and the device is shown at C. This device is made in the form of an inverted cup and is provided with a lower cylindrical part l and a dome-shaped upper part 2 which has a centrally arranged hole 3 therein, with the upper part surrounding the hole iiat, as shown at 4.

In applying 4my invention to a spark plug, the nuts 5 and 6 are removed and the device placed over the upper end of the central electrode 'l of the plug, with the central portion of the inner face thereof resting on the top of the porcelain portion of the plug. The lower nut 6 is then placed on the electrode and screwed tight to hold the device C in position, after which the conductor 'l has its eye placed over the electrode and finally the upper nut 5 is put in place.

As will be seen, the lower enlarged end of the device C is open and is sufficiently spaced from the metal body of the plug as to eliminate any danger of sparks passing from the device to the body and this device fully protects the porcelain or other insulating part of the plug so that there is no danger of moisture, grease, dirt or the like a considerable distance from the metal part of l the plug and said device being free of any interior projections, there is no danger of sparks jumping from the device to the metal part of the body even though the parts are wet.

It is thought fromthe foregoing description l that the advantages Aand novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

A protector for a spark plug comprising a member having its major portion of dome shape, with its lower en d of cylindrical shape and offset outwardly from the lower end of the dome-shaped part, and the upper end being substantially fiat and having a hole therein through which is adapted to pass the upper part of the central electrode of a spark plug, with the top part of the member resting against the upper end of the porcelain part of the plug and the lower nut of the central electrode engaging the top part of the member for holding the same in place, the interior of the member being unobstructed and said member extending downwardly to a point slightly below the point where the insulation body of the spark plug enters the metal shell, the substantialeter to space the rest of the member a considerable distance from the upper portion of the porcelain body, with the cylindrical lower part of the member spaced a considerable distance from the upper portion of the metal shell.

JOHN D. KONDRUP.

ly flat top of the member being of sufficient diam- 40 

